Let-off mechanism for looms



A. PRWUET. LET-OFF MECHANISM FOR LOOMS.

APPLICATION FILED APR. 25. 1918.

Patented Jan. 7, 1919.

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UNITED STATES PATENT OFFICE.

ANDREW PRIQUET, OF HALEDOIT, NEW JERSEY, ASSIGNOR T0 MIESCH MANUFACTUR- ING- COMPANY, OF PETERSON, JERSEY, A CORPORATION OF NEW JERSEY.

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Application filed April 25, 1918.

To all whom it may concern:

Be it known that T, ANDREW PRIQUET, a citizen of the United States, residing at Haledon, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Let-OE Mechanisms for Looms, of which the following is a specification.

This invention relates to let-off mechanisms for looms and its principal object is to produce a simple and reliable let-oif mechanism whose operation will be characterized by avoidance of the slightest jerky or vibratory release of the beam, the release on the other hand being always of an even slip-friction character regardless of the degree of tension which, ac cording to the goods being woven, it may be necessary to impose. Another object is to provide for an ample letting back of the warp in such manner that while the slack that would otherwise be produced is taken up by an appropriate part of the mechanism another part thereof holds the beam securely against rotation at this time. Still another object is to construct the mechanism so as to afford ample freedom of access in introducing the filled beams and removing the empty ones.

In the drawing,

Figure 1 is a side elevation of the improved let-off mechanism: and

Fig. 2 is a plan view. the support for the mechanism being shown in section on the line 22 in Fig. 1.

a designates suitable brackets forming the said support. and b a beam journaled therein on a horizontal axis and having peripherallv grooved flanges, according to a we1l-known construction.

0 is a lever consistin of two lever arms d fulcrumed on stud c in the brackets a and connected by the rods f and g, on the former of which is preferably journaled a roller h to form the warpuiding portion of lever c and on the latter of which may be arranged any suitable number of weights 2'; rod 9 is preferably outward of rod f, and rod f is preferably arranged in upstanding portions d of the lever arms d.

j is another lever consisting of two lever arms 7c fulcrumed on studs Z in the brackets c and connected by a rod m, on which is preferably journaled a roller 'n to form the warp-guiding portion of lever j.

Specification of Letters Patent.

Patented Jan. '7, 1919.

Serial No. 230,669.

inwardly of rod m holes are formed in the lever arms k to receive studs 0 of braking shoes 29, which are thus pivoted in the lever arms and may be shifted therein parallel with the axis of the beam to suit various widths of beams. The lever arms in this case have slight movement with reference to each other so that either brake device 1) can accommodate itself independently of the other to periphery-irregularities of the beam. Each shoe 7) has a braking face 1 curved to the same are as and in cross section more or less conforming to the grooved periphery of the beam. The braking. shoes may, with advantage, be formed of yielding rubber.

The arrangement is such that the roller a of lever j is between the beam and the roller 71.. The warp is adapted to extend from the beam, over roller a and then under roller 71., to the take-up mechanism.

Brake device 79 moves in an are cutting the periphery of the beam at a point in substantially the same horizontal plane as the axis of the beam, with which it is noted it has limited contact. Lever j, therefore, tends by its own weight plus the weight of lever c acting on lever j through the warp, to resist rotation of the beam, but without appreciable disposition of its brake device to adhere thereto in a manner characteristic of the well-known bands or straps. In view of these circumstances, and in view of the further fact that according to my invention the lever 0 does not have contact with lever y at anytime in automatic letting 013?, but is simply raised by the warp to a posi tion where the roller 72, is sufiiciently high with respect to roller n so that the weight of lever 0 becomes more or less an immaterial factor in exerting downward pressure on the brake device, the release of the beam takes place in an entire absence of jerkiness and without the beam jumping from one braked position to the next, which of course produces markings, such as shiers or undue spacings of the weft, in the finished fabric. The fluctuation of the pressure of the brake device on the beam I find operates to best advantage in causing the release to be always of a slip-friction character, without jerkiness or jumping, if, as preferred, the element q is a resilient medium, as rubber. Of course, following each release, the lever 0 tends to fall so that its weight again becomes effective to exert pressure on the brake device p; but the letting oif actionis so under control at all times that the movement of either lever is hardly apparent.

In letting-back the warp, the member 0 retains the warp under control (in a state of tension) and the member 7' holds the beam fast, until the member 0 engages some obstacle below, as the floor; preferably member c is so arranged and constructed as to give it ample range of free downward movement without the tension under which the members thus maintain the warp being affected.

After a letting back of the warp the auto matic release of the latter will obviously begin when member 0 has been raised to about the position shown, the beam up to that point being held fast. 7

When member 0 is allowed to fall to the fioor and member j raised as far as it will go, ample clearance is afforded for the operations incident to the replacing of an empty beam by a filled one.

Having thus fully described my inven tion, what I claim as new and desire to secure by Letters Patent is:

In combination, a support, a warp-beam journaled in the support, a warp-tension means arranged in the support and including two warp-tension levers each having a warp-guiding portion arranged outwardly of the periphery of the beam, one lever having its fulcrum above the horizontal axis of the beam and including a brake device movable with said lever in an are cutting the periphery of the beam and normally having limited contact with said periphery at a point near the same horizontal plane as said axis and said lever having its warp-guiding portion nearer to the beam than the warpguiding portion of the other lever, and said other lever being movable upwardly to the warp-releasing limit clear of the first-named lever, the warp being adapted to extend over and under, respectively, the warp guiding portions of the first and second levers.

In testimony whereof I allix my signature.

ANDREW? PRIQUET.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentn, Washington, D. G. 

